This contains the Wren source code. It is organized like so:
* `optional`: the Wren and C source code for the optional modules. These are
built in to the VM and can be used even when you embed the VM in your own
application. But they are also optional and can be compiled out by setting
defines.
* `cli`: the source code for the command line interface. This is a custom
executable that embeds the VM in itself. Code here handles reading
command-line, running the REPL, loading modules from disc, etc.
* `include`: the public header directory for the VM. If you are embedding the
VM in your own application, you will add this to your include path.
* `module`: the source code for the built-in modules that come with the CLI.
These modules are written in a mixture of C and Wren and generally use
[libuv][] to implement their underlying functionality.
* `vm`: the source code for the Wren VM itself. Unlike code in `cli` and
`module`, this has no dependencies on libuv. If you are embedding the VM in
your own application from source, you will compile the files here into your
app.
[libuv]: http://libuv.org/